20421214213 has 2 divisors, whose sum is σ = 20421214214. Its totient is φ = 20421214212.

The previous prime is 20421214189. The next prime is 20421214241. The reversal of 20421214213 is 31241212402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16614694404 + 3806519809 = 128898^2 + 61697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20421214213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20421214243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210607106 + 10210607107.

It is an arithmetic number, because the mean of its divisors is an integer number (10210607107).

Almost surely, 2^20421214213 is an apocalyptic number.

It is an amenable number.

20421214213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20421214213 is an equidigital number, since it uses as much as digits as its factorization.

20421214213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 20421214213 its reverse (31241212402), we get a palindrome (51662426615).

The spelling of 20421214213 in words is "twenty billion, four hundred twenty-one million, two hundred fourteen thousand, two hundred thirteen".